I combined it with a few other apps and got a fairly good understanding of Thai. I stopped using the others, but still look forward to the new word every day.
Nice, I am able to add to my previous comment. I recently went from a 16GB iPad to a 32GB iPad in the transition lost my "words of the day" which had accumulated over over five months. That part of the app had become one of my favorite features, as it uses the words in a variety of sentences.
Blueskysmilin about Learn Thai - Free WordPower, v4.1.1